All vulnerabilities
CVE-2026-20321

Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability

Cisco Cisco Application Policy Infrastructure Controller (APIC)Network & edge
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.43%Chance of exploitation activity in the next 30 days, higher than 36% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published7 Oct 2026Updated 8 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials.

This vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.

Text from CVE List

Affected versions 11

  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(1d)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2a)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2b)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2c)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2d)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2e)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 5.3(2f)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 6.1(5e)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 6.2(1f)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 6.2(1g)CVE List
  • Cisco Application Policy Infrastructure Controller (APIC)affected: 6.2(2e)CVE List

References 1